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barriers, I'll often say things l.ke, If the spectator considers the correct solution, he'll be forced ro abandon ,t because..." I,'s ¡mporunl ro ^ stand that this phrasing is merely an analytical device. Our goal is not that [he specrator will consider the correct solution and eventually decide "No ikt can't be it because of [the conceptual barrier)." Rather our goal js that' because of the conceptual barrier, the correct solution will mvec occur to the spectator in the first place.

We often speak figuratively of someone running into a brick wall. But have you ever seen anyone literally run into a brick wall? Of course not. The reason is that, if a runner sees a brick wall, he doesn't run towards it As soon as he sees it, he turns off in a different direction. This is an automatic, almost unconscious, reaction.

Imagine that you were lost in a male of alleys. If you saw a brick wall off to your right you would hardly give it a moment's thought. You're look ing for an exit, not a barrier. You wouldn't run toward the brick wall and you wouldn't waste rime speculating about what might be on the other side. You would simply look elsewhere for a way out. It's the same with an effective conceptual barrier. It doesn't talk the spectator out of a solution he's considering. It ensures that he'll turn away from the correct solution before considering it.

Conceptual barriers can take many forms. By way of example, let's , at two of rhe most common types: physical barriers and information barriers.

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